/Engine/Source/Runtime/Experimental/FieldSystem/Source/FieldSystemEngine/Public/Field/FieldSystemObjects.h
Box scalar field that will be defined only within a box
[UBoxFalloff](API\Runtime\FieldSystemEngine\Field\UBoxFalloff) * SetBoxFalloff ( float Magnitude, float MinRange, float MaxRange, float Default, FTransform Transform, EFieldFalloffType Falloff )